Simulation of Three-Dimensional Ground Motion in Los Angeles from Large Earthquakes in Southern California

奥尔森：这项研究涉及到南加州大地震的三维强震计算。在这项工作的早期，密集的计算需求导致了在大规模并行计算机上运行的算法的发展。采用三维四阶交错网格有限差分方法，模拟了洛杉矶盆地和圣费尔南多盆地三维构造模型中的地震波传播。结果表明，即使是盆地外的中等地震，由于盆地效应，也会引起盆地内的破坏运动。该项目将通过比较1992年M=7.3兰德斯地震模拟与实际数据，计算地震破裂复杂性变化的影响，并计算地形散射的影响，进一步开展早期工作。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊

9628682 Olsen This research involves the calculation of three-dimensional strong motion from large earthquakes applied to southern California situations. Intensive computational requirements earlier in this work have led to the development of algorithms that run on massively parallel computers. A 3-D 4th order staggered-grid finite-difference method was used to simulate wave propagation in a model of the Los Angeles basin including the 3-D structures of the Los Angeles and San Fernando basins. The results showed that even moderate earthquakes outside the basins can cause damaging motions within the basin due to basin effects. This project will further earlier work by comparing the 1992 M=7.3 Landers earthquake simulations with actual data, calculating the effect of varying rupture complexity of the earthquakes, and calculating the effects of topographic scattering. This research is a component of the National Earthquake Hazard Reduction Program. ***